The same can be said of Trump--he's 74 and obese, which I would say puts him and Biden at least around the same level of health. It would be re-assuring to have younger candidates, but you can't claim this is an issue for one candidate but not his heavy, three-years-junior opponent.

At the end of the day as long as the president has the ability to choose competent advisors / cabinet member I think they'll be successful, and I definitely have more confidence in Biden's ability to do this.